柚木菌根及其对苗期生长影响的研究

Research on Mycorrhiza of Tectona grandis and Its Effect on Seedling Growth

在广东、广西、云南 7个点进行采样调查的结果表明 ,在自然条件下 ,7个柚木根系样品全部感染AM菌 ,感染率达 4 0 % 70 % ,感染指数达 11 6 7 19 17;4个AM菌对 12个不同地理种源柚木苗人工接种的结果表明 ,全部处理均形成感染 ,感染率达 70 % 10 0 % ;利用 3个AM菌对 4个柚木无性系进行人工接种 ,感染率达 86 % 10 0 % ,感染指数达 2 8 33 5 2 5 0 ;接种株苗高比对照增加 5 4 0 % 4 0 8% ,地径增加 5 % 4 30 % ,生物量增加 116 4 % 2 5 74 8% ;统计结果表明 ,无论无性系、菌种或无性系×菌种在苗木高、地径及生物量上与对照的差异均为极显著 ;综合比较 ,3个菌种对柚木生长均有接种效果 ,以G90 0 4效果最好 ,G6 0 0 8菌株次之 ,再次是G30 0

The results of sampling investigation at 7 sites in three provinces of south China showed that all of the seven root samples of Teak were infected by Arbuscular mycorrhizal fungi with an infecting rate of 40% 70% and infecting index of 11.67 19.17 in the natural condition. The research results of teak seedlings of 12 provenances inoculated artificially by 4 AMF showed all the inoculated treatments were with an infection rate of 70% 100%. 4 clones of teak seedlings were inoculated with 3 AMF and the infection rate was 86% 100% and the infection index 28.33 52.5. The height, ground diameter and biomass of inoculated seedlings increased respectively by 54.0% 408%,5% 430% and 116.4% 2 574.8% compared with the control seedlings. The results of variance analysis showed that the differences among clones, mycorrhizal strains or clone×mycorrhizal strains on seedling height, ground diameter and biomass comparing with contrast were high remarkable. In conclusion, the three mycorrhizas strains have inoculation effect on the growth of seedlings, with the best one strain G9004, followed by strain G6008 and strain G3006.